CN203242585U

CN203242585U - Electromagnet backup protection device for low-pressure breakers

Info

Publication number: CN203242585U
Application number: CN 201320263502
Authority: CN
Inventors: 李涛; 尤一龙
Original assignee: Daqo Group Co Ltd
Current assignee: Jiangsu Daquan Kaifan Switch Co ltd
Priority date: 2013-05-14
Filing date: 2013-05-14
Publication date: 2013-10-16
Anticipated expiration: 2023-05-14

Abstract

The utility model discloses an electromagnet backup protection device for low-pressure breakers. The device comprises supporting members fixed in a breaker, a linkage drawbar which is movably connected to the supporting members and can rotate around movable connecting shafts, yokes fixed on main circuit wire terminals and located under the linkage drawbar, compressed springs each with one end fixed on the supporting members and the other end fixed on the linkage drawbar, and armatures arranged on the bottom face of the linkage drawbar at positions in response to the positions of the yokes. The device, small and compact, can be installed in the body of a breaker directly. The device is directly driven by the rotation of the linkage drawbar to push to release a plastic lock, so that the time needed for reactions to a short circuit is substantially shortened, and the capability of short-circuit protection is improved. The device ensures more thorough protection especially for low-capacity electronic breakers.

Description

A kind of electric magnet backup protection apparatus of low-voltage circuit breaker

Technical field

The utility model relates to a kind of low-voltage circuit breaker electric magnet backup protection apparatus, belongs to Low Voltage Electrical Apparatus.

Background technology

Low-voltage circuit breaker, as low-voltage distribution system protection electrical appliance, can the on-load on-off circuit, again can be in the lower automatic trip of short circuit, overload and low-voltage (decompression).Breaker of plastic casing of the prior art does not often have electric magnet backup protection apparatus because volume is little, in addition, triggers circuit breaker tripping and usually adopts secondary facility, and triggering link, more to cause triggering required time longer; For the circuit breaker that adopts electronic type release; need to go through main circuit current detects, amplifies; then send signal and trigger the steps such as circuit breaker tripping action to electronic type release; the dropout required time is just long like this; in case the other electronic trip unit normally minute deenergizing that breaks down; protected equipment and device for switching will be subjected to huge thermal shock and electrodynamic action, and consequence is very serious.

The utility model content

For the defects that the prior art Low Voltage Circuit Breaker exists, the utility model provides a kind of low-voltage circuit breaker electric magnet backup protection apparatus.

The technical solution of the utility model is:

A kind of electric magnet backup protection apparatus of low-voltage circuit breaker; comprise the strutting piece that is fixed in the circuit breaker; be movably connected on the strutting piece, can be along the interlock draw bar that is flexibly connected axis rotation; be fixed on the major loop line conductor row of breaker body, be positioned at the yoke of interlock draw bar below; one end is fixed on the strutting piece, the other end is fixed on the stage clip of interlock on the draw bar, is arranged on the interlock draw bar bottom surface, its position armature corresponding with the position of yoke.

As further improvement of the utility model, described yoke is provided with fixing hole, and yoke is fixedly attached to the major loop line conductor row of breaker body by fixing hole and screw.

As further improvement of the utility model, a side of described strutting piece is provided with columniform the first boss, also be provided with columniform the first groove on the strutting piece, strutting piece is realized from fixing between two bases of circuit breaker by the first boss and the first groove.

As further improvement of the utility model, described strutting piece is provided with bayonet socket, the position corresponding with bayonet socket is provided with cylindrical connecting axle on the interlock draw bar side, and connecting axle is arranged in the bayonet socket of strutting piece, makes the interlock draw bar be rotated motion around connecting axle.

As further improvement of the utility model, interlock draw bar bottom is provided with the second groove, and described armature is arranged in the second groove of interlock draw bar bottom.

As further improvement of the utility model, described interlock draw bar is provided with conical the second boss, strutting piece is provided with position conical three boss corresponding with the second lug boss position, one end of stage clip is fixed on taper shape the 3rd boss on the strutting piece, and the other end is fixed on taper shape the second boss on the interlock draw bar.

The beneficial effects of the utility model are:

The volume of the electric magnet backup protection apparatus of the utility model low-voltage circuit breaker is small and exquisite; cooperate compact; can be directly installed on the breaker body; this device directly drives in draw bar and rotates; thereby promoting plastic lock catch threads off; shorten greatly the required time of short circuit action, improved the ability of short-circuit protection.Especially for the low capacity electronic breaker, adopt this device will be so that the defencive function of circuit breaker is more comprehensive.

Description of drawings

Fig. 1 is the structure chart of the electric magnet backup protection apparatus of a kind of low-voltage circuit breaker of the utility model;

Fig. 2 is the scheme of installation of the electric magnet backup protection apparatus of a kind of low-voltage circuit breaker of the utility model;

Fig. 3 is the structure chart of yoke in the utility model;

Fig. 4 is half the structure chart of close outer surface of strutting piece in the utility model;

Fig. 5 is half the structure chart of close inner surface of strutting piece in the utility model;

Fig. 6 is the structure chart of interlock draw bar in the utility model;

Fig. 7 is the structure chart of armature in the utility model;

Fig. 8 is the working state figure of electric magnet backup protection apparatus during without short circuit current in the circuit breaker;

Fig. 9 is the working state figure of electric magnet backup protection apparatus when in the circuit breaker short circuit current being arranged.

Among the figure: 1, strutting piece; 2, interlock draw bar; 3, the first groove; 4, stage clip; 5, armature; 6, fixing hole; 7, bayonet socket; 8, connecting axle; 9, the second boss; 10, the 3rd boss; 11, the second groove; 12, the first boss; 13, yoke; 14, major loop line conductor row; 15, snap close.

Embodiment

Below in conjunction with accompanying drawing the utility model is described in further detail.

The structure of a kind of electric magnet backup protection apparatus of the utility model comprises as shown in Figure 1:

Yoke 13 has fixing hole 6 on the yoke, be fixedly attached to by screw on the major loop line conductor row 14 of breaker body.(with reference to figure 3)

Strutting piece 1 is used for supporting interlock draw bar 2, it simultaneously has cylindrical the first boss 12, and tow sides have cylindrical first groove 3, realize from fixing (with reference to figure 2) between two bases of circuit breaker by the first boss 12 and the first groove 3.There is conical the 3rd boss 10 and a bayonet socket 7 strutting piece 1 upper end.(with reference to figure 4 and Fig. 5)

Interlock draw bar 2, the cylindrical connecting axle 8 on the interlock draw bar 2 is stuck in the bayonet socket 7 of strutting piece 1, makes interlock draw bar 2 can only be rotated motion.On the interlock draw bar 2 two conical the second boss 9 are arranged.(with reference to figure 6)

Stage clip 4, an end of stage clip 4 are fixed on taper shape the 3rd boss 10 on the strutting piece 1, and the other end is fixed on taper shape the second boss 9 on the interlock draw bar 2.

Armature 5, armature 5 are arranged in the second groove 11 of interlock draw bar 2 bottoms.(with reference to figure 7)

Strutting piece 1 by with circuit breaker on boss and groove fit fix; connecting axle 8 on the interlock draw bar 2 is stuck on the bayonet socket 7 of strutting piece 1; stage clip 4 two ends are individually fixed on the conical boss of strutting piece 1 and interlock draw bar 2; stage clip 4 applies spring force to interlock draw bar 2 and causes linking draw bar 2 to the direction rotation away from yoke 13; spacing by electronic trip unit; stop interlock draw bar 2 to continue rotation; the draw bar 2 that links this moment becomes a certain acute angle with horizontal plane; this angle is the start angle of interlock draw bar 2; corresponding state is the operating state of electric magnet backup protection apparatus during without short circuit current in the circuit breaker, and this state as shown in Figure 8.

When short trouble occurring, have in the electric magnet backup protection apparatus greater than the short circuit current of setting and flow through, yoke 13 is magnetized with armature 5, becomes opposite polarity two blocks of magnet, and the electromagnetic force between them is greater than the spring force of stage clip 4, both adhesives.The adhesive of yoke 13 and armature 5 drive interlock draw bar 2 near the direction rotation of yoke 5 until yoke 13 contacts with armature 5, and then promote plastic lock catch 15 on the circuit breaker, make circuit breaker tripping, thereby the cut-out circuit, this state is as shown in Figure 9.When the electric current of major loop during less than certain certain value or interruption of power supply, electromagnetic attraction is less than the spring force of stage clip 4, and interlock draw bar 2 will return original off-position under the effect of spring.

Armature 5 in the magnetic backup protection equipment provided by the utility model and yoke 13 can be opposite polarity magnet by current magnetization in the same way; and under less electric current, producing electromagnetic force adhesive yoke 13 and the armature 5 that enough overcomes the stage clip spring force, armature 5 directly drives interlock draw bar 2 and promotes snap close 15 so that circuit breaker tripping.

Electric magnet backup protection apparatus volume provided by the utility model is small and exquisite; cooperate compact; can be directly installed on the breaker body; this device directly drives in draw bar and rotates; thread off thereby promote plastic lock catch, shortened greatly the required time of short circuit action, improved the ability of short-circuit protection; especially for the low capacity electronic breaker, adopt this device will be so that the defencive function of circuit breaker is more comprehensive.

The above only is preferred embodiment of the present utility model, not in order to limit the utility model.All any modifications of within spirit of the present utility model and principle, doing, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.

Claims

1. the electric magnet backup protection apparatus of a low-voltage circuit breaker; it is characterized in that: comprise the strutting piece (1) that is fixed in the circuit breaker; be movably connected on the strutting piece; can be along the interlock draw bar (2) that is flexibly connected axis rotation; be fixed on the major loop line conductor row of breaker body; be positioned at the yoke (13) of interlock draw bar (2) below; one end is fixed on the strutting piece (1); the other end is fixed on the stage clip (4) on the interlock draw bar (2), is arranged on interlock draw bar (2) bottom surface; the armature (5) that its position is corresponding with the position of yoke (13).

2. the electric magnet backup protection apparatus of low-voltage circuit breaker as claimed in claim 1; it is characterized in that: described yoke (13) is provided with fixing hole (6), and yoke (13) is fixedly attached to the major loop line conductor row of breaker body by fixing hole (6) and screw.

3. the electric magnet backup protection apparatus of low-voltage circuit breaker as claimed in claim 1; it is characterized in that: a side of described strutting piece (1) is provided with columniform the first boss (12); also be provided with columniform the first groove (3) on the strutting piece (1), strutting piece (1) is realized from fixing between two bases of circuit breaker by the first boss (12) and the first groove (3).

4. the electric magnet backup protection apparatus of low-voltage circuit breaker as claimed in claim 1; it is characterized in that: described strutting piece (1) is provided with bayonet socket (7); the position corresponding with bayonet socket (7) is provided with cylindrical connecting axle (8) on interlock draw bar (2) side; connecting axle (8) is arranged in the bayonet socket (7) of strutting piece (1), makes interlock draw bar (2) be rotated motion around connecting axle (8).

5. the electric magnet backup protection apparatus of low-voltage circuit breaker as claimed in claim 1 is characterized in that: interlock draw bar (2) bottom is provided with the second groove (11), and described armature (5) is arranged in second groove (11) of interlock draw bar (2) bottom.

6. such as the electric magnet backup protection apparatus of the described low-voltage circuit breaker of any one in the claim 1 to 5; it is characterized in that: described interlock draw bar (2) is provided with conical the second boss (9); strutting piece (1) is provided with position conical three boss (10) corresponding with the second boss (9) position; one end of stage clip (4) is fixed on taper shape the 3rd boss (10) on the strutting piece (1), and the other end is fixed on taper shape the second boss (9) on the interlock draw bar (2).